Who invented the chopper bike?

The company most likely to get the vote for the invention of the chopper is Raleigh bikes. However I do believe the concept and design were by an american company (forget who now) Original bikes were launched right an the end of the '60's. I have heard the whole monkey bar long seat design was out in America before this but as I am for the UK I can't be sure if it. Anyhow "chopper" is a brand name owned by Raleigh. And I also believe they have the patent. So legally I guess Raleigh is the answer..